正在从Azure Blob存储下载图像
正在从Azure Blob存储下载图像
提问于 2018-06-12 17:19:53
我正在编写一个程序，可以从Azure存储容器中的指定文件路径下载图像。
我已经将在线找到的代码中的以下函数组合在一起，然后删除错误。然而，最后的错误我无法摆脱。
完整代码如下：
using System;
using System.Windows.Forms;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using System.IO;
namespace WarehousePhotoProgram
{
public partial class Form1 : Form
{
string storageConnectionString = Environment.GetEnvironmentVariable("storageconnectionstring");
public Form1()
{
InitializeComponent();
}
private void DownloadFileFromBlob(string fileName, string containerName)
{
CloudStorageAccount account = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue(storageConnectionString));
CloudBlobClient blobClient = account.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
CloudBlob blob = container.GetBlobReference(fileName);
MemoryStream memStream = new MemoryStream();
blob.DownloadToStream(memStream);
Response.ContentType = blob.Properties.ContentType;
Response.AddHeader("Content-Disposition", "Attachment; filename=" + fileName.ToString());
Response.AddHeader("Content-Length", blob.Properties.Length.ToString());
Response.BinaryWrite(memStream.ToArray());
}
}
}RoleEnvironment上的代码当前错误地指出名称空间不存在，我是否遗漏了程序集引用？或者我需要导入另一个using。第二个错误发生在所有Result.上，同样指出Response不存在。
这也是从BlobStorage下载图片的最好方法吗?还是我应该采取另一种方法？
编辑:我在给定答案的帮助下解决了RoleEnvironment错误。现在正在尝试确定代码的响应部分也需要更改哪些内容。
public Form1()
{
InitializeComponent();
//_storageAccount = CloudStorageAccount.Parse(storageConnectionString);
DownloadFileFromBlob("029000/1.png", "warehouseimages", "Desktop");
}
private void DownloadFileFromBlob(string fileName, string containerName, string localFilePath)
{
CloudStorageAccount account = CloudStorageAccount.Parse(storageConnectionString);
CloudBlobClient blobClient = account.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
CloudBlob blob = container.GetBlobReference(fileName);
using (var fileStream = System.IO.File.OpenWrite(localFilePath))
{
blob.DownloadToStream(fileStream);
MessageBox.Show("SUCCESS");
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-12 17:58:32
如果您想要将镜像下载到本地磁盘，您的代码可以修改如下：
/// <summary>
/// Download File From Blob
/// </summary>
/// <param name="fileName">For example: image.PNG</param>
/// <param name="containerName">container name of blob</param>
/// <param name="localFilePath">For example: @"C:\Test\BlobTest.PNG"</param>
private void DownloadFileFromBlob(string fileName, string containerName, string localFilePath)
{
CloudStorageAccount account = CloudStorageAccount.Parse("Your connection string");
CloudBlobClient blobClient = account.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
CloudBlob blob = container.GetBlobReference(fileName);
using (var fileStream = System.IO.File.OpenWrite(localFilePath))
{
blob.DownloadToStream(fileStream);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50813547
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